Pop-valve.



O P. GAA.

POP VALVE.

APPLICATION FILED JUNE 21, 1911.

1,013,483. I Patented Jan.2,1912.

R AWL x S Q k} N b awue-mboz .the following is a specification.

- UNITED :eor-vanvn.

To all about may concern:

Be it known that I, GHRISTIAN I Gan, a citizen of the United States, residing at Bucyrus, in the county of Crawford and State of 'Ohio, have invented certain new and use-' ful Improvements in Pop-Valves, of which My invention relates to certain new and useful improvements. in pop safety valves designed for use in connection with locomotive or other steam boilers, the construction being such as to deaden the noise of exhausting steam or other gases and the efliciency and effective operation of a valve of this type facilitated; and my invention consists of the parts, and the constructions,arrangements and combinations of parts which I willhereinafter describe and claim.

In the accompanying drawings forming part ofthis specification and in which similar reference characters indicate like parts in the several views; Figure l is a side elevation of a pop valve embodying my invention. Fig.2 is a longitudinal sectional view of the same, with parts in elevation.

In the said drawings I have illustrated an embodiment of my invention as applied to a valve designed for use upon a locomotive or like boiler, and wherein- A represents a safety valve casing of suitable design and dimensions in which the valve, B, is contained, said casing being, preferably, constructed of two parts, one of which, A, is threaded at one end for engagement with the steam pipe of a boiler and is provided with a spider or like guide, Y C. The part, A, of the casing 1s also provided with concentric spaced flanges, a, b, one of which, a, is considerably shorter than the otherand is provided with a beveled val've seat, 0, the other flange, 6, extends in line with the upper part, A, of the casing and is internally threadedand adapted to engage the externally threaded base of a mufiler, D, said muiller being double walled or formed with concentric flanges, d d, which connect at the top. The muli'ler, also has the upper portion of the interior flange, provided with numerous perforat1ons,.$e, for the escape of steam in a manner well known in this art. The interior flange, (Z,"of the Inufller forms a cylinder having parallel in ner walls for a portion of its length, said gwalls thence --converging outwardly andinerging into a hexagonal or other nut, f,

Specification of. Letters Patent.

Application filed June 23., 1811.

Serial. at.

tented Jan. 2;, area.

and being provided with holes, connecting with the perforated outer shell, A, said cylindefr forming a shell within which is contained the customary spring, h. 'i'he upper part, A, of the main casing isarranged concentric with the outer wall of the mutller and extends over the mufller, being spaced therefrom, and extending over the nut, f,

and having an opening to register with the opening in the nut through which openings pass the regulating screw, 2', said screw carrying a nut, j, which is adapted to clamp the end is seated against a disk, m, while its lower end is appropriately seated upon a disk, 92, which has at its central portion a projection which forms a pivot about which said disk may have a slight rocking motion, said pivot adapted to engage a corresponding depression in the center of the valve.

A leading feature of my present invention is the construction of the valve and the adjusting collar therefor and which parts "I will now specifically describe.

The valve is formed with a seating portion, 2, and an overhanging flange, 3, the-inner face of which is substantially horizontal or parallel with the upper and lower faces of the valve, and is formed around the underside of its periphery with a beveled seat,

'4. This valve is also formed integral with upper and lower guides, the lower guide, 0, being mounted within the splder, C, and the upper guide, P, being of piston-like form and of substantial length and having such diameter thatit slidably engages the cylindrical portion of the chamber formed within the muflier, said upper guide also receiving and housing the lower portion of the spring and the lower disk upon which said spring is seated.

Within the chamber formed by theconcentric flanges of the lower part, A, of the main casing is contained an adjusting collar, Q, adapted to circuniferentially embr'tcice screw into adjustable engagement with the inner flange, a, said collar having av be eled portion conforming to the beveled portion, l, of the valve, and having a straight portion corresponding to the straight portion, 3, be tween the two beveled faces, 2 and 4, of said valve, the collar being adjustable with relation to these faces ofv the valve and being held in its adjusted position by a nut, 1', threaded in the outer flange, b, of the part, A, of the casing and having asquare exterior adapting it for the application of a wrench or like tool.

From the foregoing be seen that the valve is devoid of knifeedges and is accurately guided by its long upper and lower guides; and that there are no knife-edgeflips to wear away and change the true working of said valve, as the double guide herein described, insures the perfect seating of the valve under all conditions, and accordingly there is no chance for the valve to cock, as it is termed, as is more or less common with other types of pop valves. Further, a valve with the construction herein shown and described will stand the greatest amount of service since there is no chance for the valve to bind and no danger of excessive strain being thrown on the valve.

The adjusting collar heretofore mentioned comes in contact with the valve at the outer edge and this is desirable because it is found that the closer the collar is to the edge of the valve, the more steam the valve will pop away. By removing the locking nut, 1', the collar can be moved up or down thereby regulating it so as to cause the valve to pop the desired amount of steam, say 1, 2, 3 or 'l pounds of steam, or Whatever amount may be desired; when the desired adjustment has been made, the collar may be secured in its adjusted position by means of the locking nut, before mentioned.

In operation, the steam exerts a pressure beneath the valve and overcomes the tension of the spring, compressing said spring and allowing the valve to rise and fully open, and steam to pass up into the doublewalled muffler, and the muflier being full of small holes the steam will pass into the outer shell or casing and will thence escape to the atmosphere through the perforations in said casing without excessive noise; in fact without any loud report. The device, therefore, constitutes substantially a noiseless pop valve combined with a muffier having an internal chamber, the area of which is substantially the same as the interior diameter of the opening in the lower part, A", of the casing and through which opening the steam is admitted directly against the valve. v

The inteior flange of the muilier constitutes ar s hell in which is contained the spring and the inner-wall of this shell forms a cylinder within which operates the description it will piston like guide, P, of the valve. This arrangement protects the spring'from the action of the steam and prevents its rustlng.

The high sustained 11a of this safetyvalve allows for the escape of a mnch greater volume of steam than s possible with the valves of corresponding size as nowconstructed.

It will be understood that the valve is elevated by the pressure of the steam and the steam passes to the muffler and thence to theatmosphere and when the pressure is reduced the spring operates to seat the valve and shut off the flow of steam.-

Having thus described my invention what I claim as new and desire to secure. by Letters Patent is 1 1. A pop safety valve having in combination a transversely divided casing provided with a steam inlet at one end and perforations at the outer end for the escape of the exhaust, a mufller within one portion of the casing and separated fromthe inner wall thereof, said muiiler having double perforated 'walls and having an internal cylindrical portion whose walls are parallel for a portion of their length and thence converge outwardly, a valve within one part .of the casing, said casing having a beveled seat for the valve, said valve having a second beveled seating-portion around its circumference, and an adjustable collar surrounding the valve having a seat for the edge seating portion thereof, said valve having a guide projecting from the center of one face and having a tubular portion of substantial length projecting from the opposite face and beingvof piston-form and slidably engaging the cylindrical chamber of the mutl'ler, a spring within the mutiler having one portion entering the space formed by said converging walls and having the other portion seating in the chamr berformed by the tubular portion of the valve, said tubular portion serving to prevent. the admission of fluid to said spring, an adjusting screw beafing on top of the spring, and lock nut for holding the screw in its adjustment.

2. A pop safety valve and mufiier having in combination; a two-part casing having a steam inlet with a beveled seat surrounding the same, bothparts of the casing having adiacent ends internally threaded; a mu.

fier within the casing separated from the wall thereof and provided with double perforatcd walls, the inner wall of the inuiiier being formed as a cylinder; and the outer wall having a threaded portion of sufficient parts therebetween; a

around the edge therebf, and having a sec ond seating portion conforming to the seat around thesteam inlet, the po.'tion of the valve between said seating portions being straight, said valve having a guided stem projecting from one side and having a tubular guide of piston-form and substantial length projecting from the other side and operating in said cylinder; a spring Within the cylinder and tubular-guide, and supported at one end by the valve; an adjusting screw engaging the other end of the spring; said casing inclosing the mufiier and receiving said screw, and having perfora tions for the escape of steam to the atmosphere; and an adjustable collar surrounding the valve having a seat for the edge 15 seating portion of the Valve, and having a straight portion Within said seating portion conforming to the corresponding portion of the valve.

In testimony whereof I afliX my signature 20 in presence of two Witnesses CHRISTIAN P. GAA.

Witnesses:

IV. J. SoHWENcK, JOHN HAUSLAIB. 

